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[[File:Jsmess in Chromium.png|thumb|upright=1.13|JSMESS emulating a CPC 6128 CPC6128 in Chromium 30 on Linux(with copious debug messages)]][[File:Jsmess firefox zoomed.png|thumb|upright=1.3|JSMESS in Firefox 24 (same rendering resolution but using page zoom to enlarge the CPC screen)]]'''JSMESS''' is a ("JavaScript MESS") was an ongoing JavaScript port of MESS (now simply called [[MESSMAME]] that runs in as of 0.162) for modern web browsers like Chrome and Firefox and . JSMESS is considered used by the Internet Archive to make their Historical Software Collection playable in web browsers. Since MAME 0.168 (released in November 2015), JSMESS is no longer necessary as MAME can compile to JavaScript (using Emscripten's emmake command) out of the box.[http://mamedev.org/releases/whatsnew_0168.txt] ==History and development roadmap== The JSMESS project was originally proposed in a [http://ascii.textfiles.com/archives/3375 October 2011 blog post] by Jason Scott (of [http://www.textfiles.com/ textfiles.com], the [http://www.archiveteam.org/ Archive Team], and [http://archive.org/ The Internet Archive]). The idea was to have a system for preservation of old computers and game consoles that runs directly in the web browser without any plugins. Initial progress was slow because the Emscripten transcompiler had to be fixed and improved during development. In 2013, JSMESS reached a fairly usable state and was declared to be in its public beta stage right now. Particularly sound  Ideally JSMESS should later also have snapshot capabilities so if e.g. a certain feature is still discussed on a problemweb page, JSMESS can take you directly to that point in the game. Also, keymapping and a virtual keyboard on the screen are planned for JSMESS, although in principle you should already be able to create keymaps in MESS and use them with JSMESS. JSMESS development is headed toward its 1.0 release. The [https://github.com/jsmess/jsmess/wiki/JSMESS-v1.0-Systems list of systems] that are supposed to be officially supported by 1.0 also includes the CPC464/664/6128 (although the printer is erroneously listed as the program medium for the CPC).

Out of Unlike a normal port (that is translated only once), the box JSMESS code is created by Emscripten directly from the MESS code every time you compile JSMESS. In the official version of JSMESS only a small selection of MESS machines can be immediately compiled to JavaScript from out of the JSMESS packagebox. Compiling Since compiling MESS in its entirety would create a JavaScript file that is far too big for web browsers to handle. So , one has to find out which parts of MESS are really needed for a given machine and create Makefiles with that subset. (JSMESS now also includes scripts that automate this task.)

A [https://github.com/mdoege/jsmess JSMESS fork] that includes the necessary Makefiles to build the CPC 6128 CPC6128 version exists.

Note that As of October 2013, sound only works in Firefox and not in Chrome/Chromium. Emulation speed in Firefox is better than in Chrome, presumably because Firefox has better support for Emscripten's asm.js-based JS code. Internet Explorer 10 was supposedly supported very well by earlier versions of JSMESS with up to [https://github.com/jsmess/jsmess/wiki/Status 100% emulation performance] (including working sound) but the ROM file cpc6128current JSMESS exits with an Emscripten error in IE 10.zip also needs  The joystick is mapped to contain Alt and the AMSDOS ROM from cpc464arrow keys by default.zip because unlike regular MESS, The development version of JSMESS only loads a single ROM ZIP file per machineat archive.org also has support for USB gamepads but no sound. ==Usage on web pages and CPC6128 demo page==

As of October 2013, sound only works in Firefox and not in Chrome/Chromium. Emulation speed in Firefox is better than in Chrome, presumably because Firefox has better support for Emscripten's asm.js-based JS code. Also, keymapping has not been done for JSMESS systems, although in principle you should be able Right now the way to create keymaps in MESS and use them with get JSMESS. The joystick running on a page is mapped to Alt and edit the arrow keys by defaulttop of messloader.js so that <tt>gamename</tt> points to a DSK file for drive A.

==CPC Also, you need to provide the zipped ROM file. Note that the ROM file cpc6128.zip as on the demo page==below also needs to contain the AMSDOS ROM from cpc464.zip because unlike regular MESS, JSMESS only loads a single ROM ZIP file per machine.

This [http://mdoege.github.io/jsmess/ JSMESS CPC demo page] (with the SubHunter ''[[Sub Hunter]]'' disc in drive A) also has a ZIP file download of the buildwith the JS, ZIPs, and HTML. Resolution is set to MODE 1 (384x272), but you can either set a higher resolution in messloader.js or use the zoom functionality of the browser to get a larger picture.

;General info*[httphttps://jsmess.textfilesgithub.com/ jsmess/jsmess Official site]*[http://archive.org/details/internetarchivecelebration20131024?start=2544 Video of Jason Scott presenting JSMESS and the Historical Software Collection] at the Internet Archive*[http://archiveteam.org/index.php?title=Javascript_Mess Archive Team wiki page] about JSMESS*[http://en.wikipedia.org/wiki/Jason_Scott_Sadofsky Jason Scott], initiator of the project, at Wikipedia;Code*[https://github.com/jsmess/jsmess GitHub source code repository] (without any CPC makefiles right now)*[https://github.com/mdoege/jsmess GitHub fork] with added CPC6128 makefiles;Demos*[http://mdoege.github.io/jsmess/ CPC6128/Sub Hunter demo page]*[https://archive.org/details/consolelivingroom The Console Living Room] at the Internet Archive